Welcome to icliniq.com.
I have read your query in detail and viewed the attached pictures (attachment removed to protect patient identity) and do understand your concern.
The Probable causes:
You are most probably suffering from hand eczema or lichen simplex. Numbness in your finger does not seem to be related to this, however, it may be seen in case of certain orthopedic such as nerve compression or medical conditions like diabetes.Treatment plan:
For the dark patches, I suggest steroid ointment containing Clobetasol twice a day for two weeks. Consult your doctor, discuss with him or her and take the medicine with consent.Preventive measures:
1. Avoid excessive use of soap.Regarding follow up:
2. I suggest apply an emollient or a moisturizing cream to your hand frequently during the daytime.
Revert back after two weeks to a dermatologist online.---> https://www.icliniq.com/ask-a-doctor-online/dermatologist